From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Add ioctl definitions to libxfs, build the necessary helpers into
libfrog and libhandle to iterate parents (and parent paths), then wire
up xfs_scrub to be able to query parent pointers from userspace. The
goal of this patch is to exercise userspace, and is nowhere near a
complete solution. A basic xfs_io parent command implementation
replaces ... whatever that is that's there now.
Totally missing: actual support in libxfs for working with parent ptrs
straight off the disk (mkfs, xfs_db, xfs_repair).
[achender: Minor syntax adjustments to sew solution in actual support
in libxfs for working with parent ptrs]
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
include/handle.h | 2 +
include/parent.h | 18 ++
include/path.h | 19 +++
io/parent.c | 471 ++++++++++++++---------------------------------------
libfrog/paths.c | 136 ++++++++++++++++
libhandle/Makefile | 2 +-
libhandle/handle.c | 7 +-
libhandle/parent.c | 325 ++++++++++++++++++++++++++++++++++++
libxfs/xfs_fs.h | 8 +
scrub/inodes.c | 26 +++
scrub/inodes.h | 2 +
scrub/phase5.c | 9 +-
12 files changed, 661 insertions(+), 364 deletions(-)
diff --git a/include/handle.h b/include/handle.h
index 49f1441..00aa43d 100644
--- a/include/handle.h
+++ b/include/handle.h
@@ -52,6 +52,8 @@ extern int fssetdm_by_handle (void *__hanp, size_t __hlen,
void fshandle_destroy(void);
+int handle_to_fsfd(void *hanp, char **path);
+
#ifdef __cplusplus
}
#endif
diff --git a/include/parent.h b/include/parent.h
index 85cef85..33f8d85 100644
--- a/include/parent.h
+++ b/include/parent.h
@@ -28,4 +28,22 @@ typedef struct parent_cursor {
__u32 opaque[4]; /* an opaque cookie */
} parent_cursor_t;
+struct path_list;
+
+typedef int (*walk_pptr_fn)(struct xfs_pptr_info *pi, struct xfs_parent_ptr *pptr,
+ void *arg);
+typedef int (*walk_ppath_fn)(const char *mntpt, struct path_list *path,
+ void *arg);
+
+#define WALK_PPTRS_ABORT 1
+int fd_walk_pptrs(int fd, walk_pptr_fn fn, void *arg);
+int handle_walk_pptrs(void *hanp, size_t hanlen, walk_pptr_fn fn, void *arg);
+
+#define WALK_PPATHS_ABORT 1
+int fd_walk_ppaths(int fd, walk_ppath_fn fn, void *arg);
+int handle_walk_ppaths(void *hanp, size_t hanlen, walk_ppath_fn fn, void *arg);
+
+int fd_to_path(int fd, char *path, size_t pathlen);
+int handle_to_path(void *hanp, size_t hlen, char *path, size_t pathlen);
+
#endif
diff --git a/include/path.h b/include/path.h
index 88dc44b..cbe4e19 100644
--- a/include/path.h
+++ b/include/path.h
@@ -70,4 +70,23 @@ typedef struct fs_cursor {
extern void fs_cursor_initialise(char *__dir, uint __flags, fs_cursor_t *__cp);
extern fs_path_t *fs_cursor_next_entry(fs_cursor_t *__cp);
+/* Path information. */
+
+struct path_list;
+struct path_component;
+
+struct path_component *path_component_init(const char *name);
+void path_component_free(struct path_component *pc);
+int path_component_change(struct path_component *pc, void *name,
+ size_t namelen);
+
+struct path_list *path_list_init(void);
+void path_list_free(struct path_list *path);
+void path_list_add_parent_component(struct path_list *path,
+ struct path_component *pc);
+void path_list_add_component(struct path_list *path, struct path_component *pc);
+void path_list_del_component(struct path_list *path, struct path_component *pc);
+
+ssize_t path_list_to_string(struct path_list *path, char *buf, size_t buflen);
+
#endif /* __PATH_H__ */
diff --git a/io/parent.c b/io/parent.c
index 55b8b49..ad51fe6 100644
--- a/io/parent.c
+++ b/io/parent.c
@@ -21,366 +21,105 @@
#include "path.h"
#include "parent.h"
#include "handle.h"
-#include "jdm.h"
#include "init.h"
#include "io.h"
-#define PARENTBUF_SZ 16384
-#define BSTATBUF_SZ 16384
-
static cmdinfo_t parent_cmd;
-static int verbose_flag;
-static int err_status;
-static __u64 inodes_checked;
static char *mntpt;
-/*
- * check out a parent entry to see if the values seem valid
- */
-static void
-check_parent_entry(xfs_bstat_t *bstatp, parent_t *parent)
-{
- int sts;
- char fullpath[PATH_MAX];
- struct stat statbuf;
- char *str;
-
- snprintf(fullpath, parent->p_reclen, _("%s%s"), mntpt,
- ((char*)parent)+sizeof(struct parent));
-
- sts = lstat(fullpath, &statbuf);
- if (sts != 0) {
- fprintf(stderr,
- _("inode-path for inode: %llu is incorrect - path \"%s\" non-existent\n"),
- (unsigned long long) bstatp->bs_ino, fullpath);
- if (verbose_flag) {
- fprintf(stderr,
- _("path \"%s\" does not stat for inode: %llu; err = %s\n"),
- fullpath,
- (unsigned long long) bstatp->bs_ino,
- strerror(errno));
- }
- err_status++;
- return;
- } else {
- if (verbose_flag > 1) {
- printf(_("path \"%s\" found\n"), fullpath);
- }
- }
-
- if (statbuf.st_ino != bstatp->bs_ino) {
- fprintf(stderr,
- _("inode-path for inode: %llu is incorrect - wrong inode#\n"),
- (unsigned long long) bstatp->bs_ino);
- if (verbose_flag) {
- fprintf(stderr,
- _("ino mismatch for path \"%s\" %llu vs %llu\n"),
- fullpath,
- (unsigned long long)statbuf.st_ino,
- (unsigned long long)bstatp->bs_ino);
- }
- err_status++;
- return;
- } else if (verbose_flag > 1) {
- printf(_("inode number match: %llu\n"),
- (unsigned long long)statbuf.st_ino);
- }
-
- /* get parent path */
- str = strrchr(fullpath, '/');
- *str = '\0';
- sts = stat(fullpath, &statbuf);
- if (sts != 0) {
- fprintf(stderr,
- _("parent path \"%s\" does not stat: %s\n"),
- fullpath,
- strerror(errno));
- err_status++;
- return;
- } else {
- if (parent->p_ino != statbuf.st_ino) {
- fprintf(stderr,
- _("inode-path for inode: %llu is incorrect - wrong parent inode#\n"),
- (unsigned long long) bstatp->bs_ino);
- if (verbose_flag) {
- fprintf(stderr,
- _("ino mismatch for path \"%s\" %llu vs %llu\n"),
- fullpath,
- (unsigned long long)parent->p_ino,
- (unsigned long long)statbuf.st_ino);
- }
- err_status++;
- return;
- } else {
- if (verbose_flag > 1) {
- printf(_("parent ino match for %llu\n"),
- (unsigned long long) parent->p_ino);
- }
- }
- }
-}
-
-static void
-check_parents(parent_t *parentbuf, size_t *parentbuf_size,
- jdm_fshandle_t *fshandlep, xfs_bstat_t *statp)
-{
- int error, i;
- __u32 count;
- parent_t *entryp;
-
- do {
- error = jdm_parentpaths(fshandlep, statp, parentbuf, *parentbuf_size, &count);
-
- if (error == ERANGE) {
- *parentbuf_size *= 2;
- parentbuf = (parent_t *)realloc(parentbuf, *parentbuf_size);
- } else if (error) {
- fprintf(stderr, _("parentpaths failed for ino %llu: %s\n"),
- (unsigned long long) statp->bs_ino,
- strerror(errno));
- err_status++;
- break;
- }
- } while (error == ERANGE);
-
-
- if (count == 0) {
- /* no links for inode - something wrong here */
- fprintf(stderr, _("inode-path for inode: %llu is missing\n"),
- (unsigned long long) statp->bs_ino);
- err_status++;
- }
-
- entryp = parentbuf;
- for (i = 0; i < count; i++) {
- check_parent_entry(statp, entryp);
- entryp = (parent_t*) (((char*)entryp) + entryp->p_reclen);
- }
-}
-
static int
-do_bulkstat(parent_t *parentbuf, size_t *parentbuf_size, xfs_bstat_t *bstatbuf,
- int fsfd, jdm_fshandle_t *fshandlep)
+pptr_print(
+ struct xfs_pptr_info *pi,
+ struct xfs_parent_ptr *pptr,
+ void *arg)
{
- __s32 buflenout;
- __u64 lastino = 0;
- xfs_bstat_t *p;
- xfs_bstat_t *endp;
- xfs_fsop_bulkreq_t bulkreq;
- struct stat mntstat;
+ char buf[XFS_PPTR_MAXNAMELEN + 1];
- if (stat(mntpt, &mntstat)) {
- fprintf(stderr, _("can't stat mount point \"%s\": %s\n"),
- mntpt, strerror(errno));
- return 1;
+ if (pi->pi_flags & XFS_PPTR_OFLAG_ROOT) {
+ printf(_("Root directory.\n"));
+ return 0;
}
- bulkreq.lastip = &lastino;
- bulkreq.icount = BSTATBUF_SZ;
- bulkreq.ubuffer = (void *)bstatbuf;
- bulkreq.ocount = &buflenout;
-
- while (xfsctl(mntpt, fsfd, XFS_IOC_FSBULKSTAT, &bulkreq) == 0) {
- if (*(bulkreq.ocount) == 0) {
- return 0;
- }
- for (p = bstatbuf, endp = bstatbuf + *bulkreq.ocount; p < endp; p++) {
-
- /* inode being modified, get synced data with iget */
- if ( (!p->bs_nlink || !p->bs_mode) && p->bs_ino != 0 ) {
-
- if (xfsctl(mntpt, fsfd, XFS_IOC_FSBULKSTAT_SINGLE, &bulkreq) < 0) {
- fprintf(stderr,
- _("failed to get bulkstat information for inode %llu\n"),
- (unsigned long long) p->bs_ino);
- continue;
- }
- if (!p->bs_nlink || !p->bs_mode || !p->bs_ino) {
- fprintf(stderr,
- _("failed to get valid bulkstat information for inode %llu\n"),
- (unsigned long long) p->bs_ino);
- continue;
- }
- }
-
- /* skip root */
- if (p->bs_ino == mntstat.st_ino) {
- continue;
- }
-
- if (verbose_flag > 1) {
- printf(_("checking inode %llu\n"),
- (unsigned long long) p->bs_ino);
- }
-
- /* print dotted progress */
- if ((inodes_checked % 100) == 0 && verbose_flag == 1) {
- printf("."); fflush(stdout);
- }
- inodes_checked++;
-
- check_parents(parentbuf, parentbuf_size, fshandlep, p);
- }
-
- }/*while*/
-
- fprintf(stderr, _("syssgi bulkstat failed: %s\n"), strerror(errno));
- return 1;
+ memcpy(buf, pptr->xpp_name, pptr->xpp_namelen);
+ buf[pptr->xpp_namelen] = 0;
+ printf(_("p_ino = %llu\n"), (unsigned long long)pptr->xpp_ino);
+ printf(_("p_gen = %u\n"), (unsigned int)pptr->xpp_gen);
+ printf(_("p_reclen = %u\n"), (unsigned int)pptr->xpp_namelen);
+ printf(_("p_name = \"%s\"\n\n"), buf);
+ return 0;
}
-static int
-parent_check(void)
+int
+print_parents(
+ struct xfs_handle *handle)
{
- int fsfd;
- jdm_fshandle_t *fshandlep;
- parent_t *parentbuf;
- size_t parentbuf_size = PARENTBUF_SZ;
- xfs_bstat_t *bstatbuf;
-
- err_status = 0;
- inodes_checked = 0;
-
- sync();
-
- fsfd = file->fd;
-
- fshandlep = jdm_getfshandle(mntpt);
- if (fshandlep == NULL) {
- fprintf(stderr, _("unable to open \"%s\" for jdm: %s\n"),
- mntpt,
- strerror(errno));
- return 1;
- }
-
- /* allocate buffers */
- bstatbuf = (xfs_bstat_t *)calloc(BSTATBUF_SZ, sizeof(xfs_bstat_t));
- parentbuf = (parent_t *)malloc(parentbuf_size);
- if (!bstatbuf || !parentbuf) {
- fprintf(stderr, _("unable to allocate buffers: %s\n"),
- strerror(errno));
- err_status = 1;
- goto out;
- }
+ int ret;
- if (do_bulkstat(parentbuf, &parentbuf_size, bstatbuf, fsfd, fshandlep) != 0)
- err_status++;
-
- if (err_status > 0)
- fprintf(stderr, _("num errors: %d\n"), err_status);
+ if (handle)
+ ret = handle_walk_pptrs(handle, sizeof(*handle), pptr_print,
+ NULL);
else
- printf(_("succeeded checking %llu inodes\n"),
- (unsigned long long) inodes_checked);
-
-out:
- free(bstatbuf);
- free(parentbuf);
- free(fshandlep);
- return err_status;
-}
+ ret = fd_walk_pptrs(file->fd, pptr_print, NULL);
+ if (ret)
+ perror(file->name);
-static void
-print_parent_entry(parent_t *parent, int fullpath)
-{
- printf(_("p_ino = %llu\n"), (unsigned long long) parent->p_ino);
- printf(_("p_gen = %u\n"), parent->p_gen);
- printf(_("p_reclen = %u\n"), parent->p_reclen);
- if (fullpath)
- printf(_("p_name = \"%s%s\"\n"), mntpt,
- ((char*)parent)+sizeof(struct parent));
- else
- printf(_("p_name = \"%s\"\n"),
- ((char*)parent)+sizeof(struct parent));
+ return 0;
}
static int
-parent_list(int fullpath)
-{
- void *handlep = NULL;
- size_t handlen;
- int error, i;
- int retval = 1;
- __u32 count;
- parent_t *entryp;
- parent_t *parentbuf = NULL;
- char *path = file->name;
- int pb_size = PARENTBUF_SZ;
-
- /* XXXX for linux libhandle version - to set libhandle fsfd cache */
- {
- void *fshandle;
- size_t fshlen;
-
- if (path_to_fshandle(mntpt, &fshandle, &fshlen) != 0) {
- fprintf(stderr, _("%s: failed path_to_fshandle \"%s\": %s\n"),
- progname, path, strerror(errno));
- goto error;
- }
- free_handle(fshandle, fshlen);
- }
-
- if (path_to_handle(path, &handlep, &handlen) != 0) {
- fprintf(stderr, _("%s: path_to_handle failed for \"%s\"\n"), progname, path);
- goto error;
- }
-
- do {
- parentbuf = (parent_t *)realloc(parentbuf, pb_size);
- if (!parentbuf) {
- fprintf(stderr, _("%s: unable to allocate parent buffer: %s\n"),
- progname, strerror(errno));
- goto error;
- }
+path_print(
+ const char *mntpt,
+ struct path_list *path,
+ void *arg) {
- if (fullpath) {
- error = parentpaths_by_handle(handlep,
- handlen,
- parentbuf,
- pb_size,
- &count);
- } else {
- error = parents_by_handle(handlep,
- handlen,
- parentbuf,
- pb_size,
- &count);
- }
- if (error == ERANGE) {
- pb_size *= 2;
- } else if (error) {
- fprintf(stderr, _("%s: %s call failed for \"%s\": %s\n"),
- progname, fullpath ? "parentpaths" : "parents",
- path, strerror(errno));
- goto error;
- }
- } while (error == ERANGE);
+ char buf[PATH_MAX];
+ size_t len = PATH_MAX;
+ int ret;
- if (count == 0) {
- /* no links for inode - something wrong here */
- fprintf(stderr, _("%s: inode-path is missing\n"), progname);
- goto error;
+ ret = snprintf(buf, len, "%s", mntpt);
+ if (ret != strlen(mntpt)) {
+ errno = ENOMEM;
+ return -1;
}
- entryp = parentbuf;
- for (i = 0; i < count; i++) {
- print_parent_entry(entryp, fullpath);
- entryp = (parent_t*) (((char*)entryp) + entryp->p_reclen);
- }
+ ret = path_list_to_string(path, buf + ret, len - ret);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
- retval = 0;
-error:
- free(handlep);
- free(parentbuf);
- return retval;
+int
+print_paths(
+ struct xfs_handle *handle)
+{
+ int ret;
+
+ if (handle)
+ ret = handle_walk_ppaths(handle, sizeof(*handle), path_print,
+ NULL);
+ else
+ ret = fd_walk_ppaths(file->fd, path_print, NULL);
+ if (ret)
+ perror(file->name);
+ return 0;
}
int
-parent_f(int argc, char **argv)
+parent_f(
+ int argc,
+ char **argv)
{
- int c;
- int listpath_flag = 0;
- int check_flag = 0;
- fs_path_t *fs;
- static int tab_init;
+ struct xfs_handle handle;
+ void *hanp = NULL;
+ size_t hlen;
+ struct fs_path *fs;
+ char *p;
+ uint64_t ino = 0;
+ uint32_t gen = 0;
+ int c;
+ int listpath_flag = 0;
+ int ret;
+ static int tab_init;
if (!tab_init) {
tab_init = 1;
@@ -394,46 +133,72 @@ parent_f(int argc, char **argv)
}
mntpt = fs->fs_dir;
- verbose_flag = 0;
-
- while ((c = getopt(argc, argv, "cpv")) != EOF) {
+ while ((c = getopt(argc, argv, "p")) != EOF) {
switch (c) {
- case 'c':
- check_flag = 1;
- break;
case 'p':
listpath_flag = 1;
break;
- case 'v':
- verbose_flag++;
- break;
default:
return command_usage(&parent_cmd);
}
}
- if (!check_flag && !listpath_flag) /* default case */
- exitcode = parent_list(listpath_flag);
- else {
- if (listpath_flag)
- exitcode = parent_list(listpath_flag);
- if (check_flag)
- exitcode = parent_check();
+ /*
+ * Always initialize the fshandle table because we need it for
+ * the ppaths functions to work.
+ */
+ ret = path_to_fshandle((char *)mntpt, &hanp, &hlen);
+ if (ret) {
+ perror(mntpt);
+ return 0;
+ }
+
+ if (optind + 2 == argc) {
+ ino = strtoull(argv[optind], &p, 0);
+ if (*p != '\0' || ino == 0) {
+ fprintf(stderr,
+ _("Bad inode number '%s'.\n"),
+ argv[optind]);
+ return 0;
+ }
+ gen = strtoul(argv[optind + 1], &p, 0);
+ if (*p != '\0') {
+ fprintf(stderr,
+ _("Bad generation number '%s'.\n"),
+ argv[optind + 1]);
+ return 0;
+ }
+
+ memcpy(&handle, hanp, sizeof(handle));
+ handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
+ sizeof(handle.ha_fid.fid_len);
+ handle.ha_fid.fid_pad = 0;
+ handle.ha_fid.fid_ino = ino;
+ handle.ha_fid.fid_gen = gen;
+
}
+ if (listpath_flag)
+ exitcode = print_paths(ino ? &handle : NULL);
+ else
+ exitcode = print_parents(ino ? &handle : NULL);
+
+ if (hanp)
+ free_handle(hanp, hlen);
+
return 0;
}
static void
parent_help(void)
{
- printf(_(
+printf(_(
"\n"
" list the current file's parents and their filenames\n"
"\n"
-" -c -- check the current file's file system for parent consistency\n"
-" -p -- list the current file's parents and their full paths\n"
-" -v -- verbose mode\n"
+" -p -- list the current file's paths up to the root\n"
+"\n"
+"If ino and gen are supplied, use them instead.\n"
"\n"));
}
@@ -444,9 +209,9 @@ parent_init(void)
parent_cmd.cfunc = parent_f;
parent_cmd.argmin = 0;
parent_cmd.argmax = -1;
- parent_cmd.args = _("[-cpv]");
+ parent_cmd.args = _("[-p] [ino gen]");
parent_cmd.flags = CMD_NOMAP_OK;
- parent_cmd.oneline = _("print or check parent inodes");
+ parent_cmd.oneline = _("print parent inodes");
parent_cmd.help = parent_help;
if (expert)
diff --git a/libfrog/paths.c b/libfrog/paths.c
index c7895e9..9fb0140 100644
--- a/libfrog/paths.c
+++ b/libfrog/paths.c
@@ -27,6 +27,7 @@
#include "path.h"
#include "input.h"
#include "project.h"
+#include "list.h"
#include <limits.h>
extern char *progname;
@@ -632,3 +633,138 @@ fs_table_insert_project_path(
exit(1);
}
}
+
+
+/* Structured path components. */
+
+struct path_list {
+ struct list_head p_head;
+};
+
+struct path_component {
+ struct list_head pc_list;
+ char *pc_fname;
+};
+
+/* Initialize a path component with a given name. */
+struct path_component *
+path_component_init(
+ const char *name)
+{
+ struct path_component *pc;
+
+ pc = malloc(sizeof(struct path_component));
+ if (!pc)
+ return NULL;
+ INIT_LIST_HEAD(&pc->pc_list);
+ pc->pc_fname = strdup(name);
+ if (!pc->pc_fname) {
+ free(pc);
+ return NULL;
+ }
+ return pc;
+}
+
+/* Free a path component. */
+void
+path_component_free(
+ struct path_component *pc)
+{
+ free(pc->pc_fname);
+ free(pc);
+}
+
+/* Change a path component's filename. */
+int
+path_component_change(
+ struct path_component *pc,
+ void *name,
+ size_t namelen)
+{
+ void *p;
+
+ p = realloc(pc->pc_fname, namelen + 1);
+ if (!p)
+ return -1;
+ pc->pc_fname = p;
+ memcpy(pc->pc_fname, name, namelen);
+ pc->pc_fname[namelen] = 0;
+ return 0;
+}
+
+/* Initialize a pathname. */
+struct path_list *
+path_list_init(void)
+{
+ struct path_list *path;
+
+ path = malloc(sizeof(struct path_list));
+ if (!path)
+ return NULL;
+ INIT_LIST_HEAD(&path->p_head);
+ return path;
+}
+
+/* Empty out a pathname. */
+void
+path_list_free(
+ struct path_list *path)
+{
+ struct path_component *pos;
+ struct path_component *n;
+
+ list_for_each_entry_safe(pos, n, &path->p_head, pc_list) {
+ path_list_del_component(path, pos);
+ path_component_free(pos);
+ }
+ free(path);
+}
+
+/* Add a parent component to a pathname. */
+void
+path_list_add_parent_component(
+ struct path_list *path,
+ struct path_component *pc)
+{
+ list_add(&pc->pc_list, &path->p_head);
+}
+
+/* Add a component to a pathname. */
+void
+path_list_add_component(
+ struct path_list *path,
+ struct path_component *pc)
+{
+ list_add_tail(&pc->pc_list, &path->p_head);
+}
+
+/* Remove a component from a pathname. */
+void
+path_list_del_component(
+ struct path_list *path,
+ struct path_component *pc)
+{
+ list_del_init(&pc->pc_list);
+}
+
+/* Convert a pathname into a string. */
+ssize_t
+path_list_to_string(
+ struct path_list *path,
+ char *buf,
+ size_t buflen)
+{
+ struct path_component *pos;
+ ssize_t bytes = 0;
+ int ret;
+
+ list_for_each_entry(pos, &path->p_head, pc_list) {
+ ret = snprintf(buf, buflen, "/%s", pos->pc_fname);
+ if (ret != 1 + strlen(pos->pc_fname))
+ return -1;
+ bytes += ret;
+ buf += ret;
+ buflen -= ret;
+ }
+ return bytes;
+}
diff --git a/libhandle/Makefile b/libhandle/Makefile
index fe1a2af..d3cea41 100644
--- a/libhandle/Makefile
+++ b/libhandle/Makefile
@@ -16,7 +16,7 @@ else
LTLDFLAGS += -Wl,--version-script,libhandle.sym
endif
-CFILES = handle.c jdm.c
+CFILES = handle.c jdm.c parent.c
LSRCFILES = libhandle.sym
default: ltdepend $(LTLIBRARY)
diff --git a/libhandle/handle.c b/libhandle/handle.c
index 878d14d..a70fa32 100644
--- a/libhandle/handle.c
+++ b/libhandle/handle.c
@@ -41,7 +41,6 @@ typedef union {
} comarg_t;
static int obj_to_handle(char *, int, unsigned int, comarg_t, void**, size_t*);
-static int handle_to_fsfd(void *, char **);
static char *path_to_fspath(char *path);
@@ -214,8 +213,10 @@ handle_to_fshandle(
return 0;
}
-static int
-handle_to_fsfd(void *hanp, char **path)
+int
+handle_to_fsfd(
+ void *hanp,
+ char **path)
{
struct fdhash *fdhp;
diff --git a/libhandle/parent.c b/libhandle/parent.c
new file mode 100644
index 0000000..f6be3bd
--- /dev/null
+++ b/libhandle/parent.c
@@ -0,0 +1,325 @@
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#include "platform_defs.h"
+#include "xfs.h"
+#include "xfs_arch.h"
+#include "list.h"
+#include "path.h"
+#include "handle.h"
+#include "parent.h"
+
+/* Allocate a buffer large enough for some parent pointer records. */
+static inline struct xfs_pptr_info *
+xfs_pptr_alloc(
+ size_t nr_ptrs)
+{
+ struct xfs_pptr_info *pi;
+
+ pi = malloc(XFS_PPTR_INFO_SIZEOF(nr_ptrs));
+ if (!pi)
+ return NULL;
+ memset(pi, 0, sizeof(struct xfs_pptr_info));
+ pi->pi_ptrs_size = nr_ptrs;
+ return pi;
+}
+
+/* Walk all parents of the given file handle. */
+static int
+handle_walk_parents(
+ int fd,
+ struct xfs_handle *handle,
+ walk_pptr_fn fn,
+ void *arg)
+{
+ struct xfs_pptr_info *pi;
+ struct xfs_parent_ptr *p;
+ unsigned int i;
+ ssize_t ret = -1;
+
+ pi = xfs_pptr_alloc(4);
+ if (!pi)
+ return -1;
+
+ if (handle) {
+ memcpy(&pi->pi_handle, handle, sizeof(struct xfs_handle));
+ pi->pi_flags = XFS_PPTR_IFLAG_HANDLE;
+ }
+
+ ret = ioctl(fd, XFS_IOC_GETPPOINTER, pi);
+ while (!ret) {
+ if (pi->pi_flags & XFS_PPTR_OFLAG_ROOT) {
+ ret = fn(pi, NULL, arg);
+ break;
+ }
+ if (pi->pi_ptrs_used == 0)
+ break;
+ for (i = 0; i < pi->pi_ptrs_used; i++) {
+ p = XFS_PPINFO_TO_PP(pi, i);
+ ret = fn(pi, p, arg);
+ if (ret)
+ goto out_pi;
+ }
+ ret = ioctl(fd, XFS_IOC_GETPPOINTER, pi);
+ }
+
+out_pi:
+ free(pi);
+ return ret;
+}
+
+/* Walk all parent pointers of this handle. */
+int
+handle_walk_pptrs(
+ void *hanp,
+ size_t hlen,
+ walk_pptr_fn fn,
+ void *arg)
+{
+ char *mntpt;
+ int fd;
+
+ if (hlen != sizeof(struct xfs_handle)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ fd = handle_to_fsfd(hanp, &mntpt);
+ if (fd < 0)
+ return -1;
+
+ return handle_walk_parents(fd, hanp, fn, arg);
+}
+
+/* Walk all parent pointers of this fd. */
+int
+fd_walk_pptrs(
+ int fd,
+ walk_pptr_fn fn,
+ void *arg)
+{
+ return handle_walk_parents(fd, NULL, fn, arg);
+}
+
+struct walk_ppaths_info {
+ walk_ppath_fn fn;
+ void *arg;
+ char *mntpt;
+ struct path_list *path;
+ int fd;
+};
+
+struct walk_ppath_level_info {
+ struct xfs_handle newhandle;
+ struct path_component *pc;
+ struct walk_ppaths_info *wpi;
+};
+
+static int handle_walk_parent_paths(struct walk_ppaths_info *wpi,
+ struct xfs_handle *handle);
+
+static int
+handle_walk_parent_path_ptr(
+ struct xfs_pptr_info *pi,
+ struct xfs_parent_ptr *p,
+ void *arg)
+{
+ struct walk_ppath_level_info *wpli = arg;
+ struct walk_ppaths_info *wpi = wpli->wpi;
+ unsigned int i;
+ int ret = 0;
+
+ if (pi->pi_flags & XFS_PPTR_OFLAG_ROOT)
+ return wpi->fn(wpi->mntpt, wpi->path, wpi->arg);
+
+ for (i = 0; i < pi->pi_ptrs_used; i++) {
+ p = XFS_PPINFO_TO_PP(pi, i);
+ ret = path_component_change(wpli->pc, p->xpp_name,
+ p->xpp_namelen);
+ if (ret)
+ break;
+ wpli->newhandle.ha_fid.fid_ino = p->xpp_ino;
+ wpli->newhandle.ha_fid.fid_gen = p->xpp_gen;
+ path_list_add_parent_component(wpi->path, wpli->pc);
+ ret = handle_walk_parent_paths(wpi, &wpli->newhandle);
+ path_list_del_component(wpi->path, wpli->pc);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * Recursively walk all parents of the given file handle; if we hit the
+ * fs root then we call the associated function with the constructed path.
+ */
+static int
+handle_walk_parent_paths(
+ struct walk_ppaths_info *wpi,
+ struct xfs_handle *handle)
+{
+ struct walk_ppath_level_info *wpli;
+ int ret;
+
+ wpli = malloc(sizeof(struct walk_ppath_level_info));
+ if (!wpli)
+ return -1;
+ wpli->pc = path_component_init("");
+ if (!wpli->pc) {
+ free(wpli);
+ return -1;
+ }
+ wpli->wpi = wpi;
+ memcpy(&wpli->newhandle, handle, sizeof(struct xfs_handle));
+
+ ret = handle_walk_parents(wpi->fd, handle, handle_walk_parent_path_ptr,
+ wpli);
+
+ path_component_free(wpli->pc);
+ free(wpli);
+ return ret;
+}
+
+/*
+ * Call the given function on all known paths from the vfs root to the inode
+ * described in the handle.
+ */
+int
+handle_walk_ppaths(
+ void *hanp,
+ size_t hlen,
+ walk_ppath_fn fn,
+ void *arg)
+{
+ struct walk_ppaths_info wpi;
+ ssize_t ret;
+
+ if (hlen != sizeof(struct xfs_handle)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ wpi.fd = handle_to_fsfd(hanp, &wpi.mntpt);
+ if (wpi.fd < 0)
+ return -1;
+ wpi.path = path_list_init();
+ if (!wpi.path)
+ return -1;
+ wpi.fn = fn;
+ wpi.arg = arg;
+
+ ret = handle_walk_parent_paths(&wpi, hanp);
+ path_list_free(wpi.path);
+
+ return ret;
+}
+
+/*
+ * Call the given function on all known paths from the vfs root to the inode
+ * referred to by the file description.
+ */
+int
+fd_walk_ppaths(
+ int fd,
+ walk_ppath_fn fn,
+ void *arg)
+{
+ struct walk_ppaths_info wpi;
+ void *hanp;
+ size_t hlen;
+ int fsfd;
+ int ret;
+
+ ret = fd_to_handle(fd, &hanp, &hlen);
+ if (ret)
+ return ret;
+
+ fsfd = handle_to_fsfd(hanp, &wpi.mntpt);
+ if (fsfd < 0)
+ return -1;
+ wpi.fd = fd;
+ wpi.path = path_list_init();
+ if (!wpi.path)
+ return -1;
+ wpi.fn = fn;
+ wpi.arg = arg;
+
+ ret = handle_walk_parent_paths(&wpi, hanp);
+ path_list_free(wpi.path);
+
+ return ret;
+}
+
+struct path_walk_info {
+ char *buf;
+ size_t len;
+};
+
+/* Helper that stringifies the first full path that we find. */
+static int
+handle_to_path_walk(
+ const char *mntpt,
+ struct path_list *path,
+ void *arg)
+{
+ struct path_walk_info *pwi = arg;
+ int ret;
+
+ ret = snprintf(pwi->buf, pwi->len, "%s", mntpt);
+ if (ret != strlen(mntpt)) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ ret = path_list_to_string(path, pwi->buf + ret, pwi->len - ret);
+ if (ret < 0)
+ return ret;
+
+ return WALK_PPATHS_ABORT;
+}
+
+/* Return any eligible path to this file handle. */
+int
+handle_to_path(
+ void *hanp,
+ size_t hlen,
+ char *path,
+ size_t pathlen)
+{
+ struct path_walk_info pwi;
+
+ pwi.buf = path;
+ pwi.len = pathlen;
+ return handle_walk_ppaths(hanp, hlen, handle_to_path_walk, &pwi);
+}
+
+/* Return any eligible path to this file description. */
+int
+fd_to_path(
+ int fd,
+ char *path,
+ size_t pathlen)
+{
+ struct path_walk_info pwi;
+
+ pwi.buf = path;
+ pwi.len = pathlen;
+ return fd_walk_ppaths(fd, handle_to_path_walk, &pwi);
+}
diff --git a/libxfs/xfs_fs.h b/libxfs/xfs_fs.h
index e3ce233..aa613f9 100644
--- a/libxfs/xfs_fs.h
+++ b/libxfs/xfs_fs.h
@@ -610,6 +610,14 @@ struct xfs_pptr_info {
#define XFS_PPINFO_TO_PP(info, idx) \
(&(((struct xfs_parent_ptr *)((char *)(info) + sizeof(*(info))))[(idx)]))
+#define XFS_PPTR_ALL_IFLAGS (XFS_PPTR_IFLAG_HANDLE)
+
+/* partial results only */
+#define XFS_PPTR_OFLAG_PARTIAL (1U << 0)
+
+/* target was the root directory */
+#define XFS_PPTR_OFLAG_ROOT (1U << 1)
